Before Donald Trump could give his State of the Union Address filled with racist venom against migrants, he had to get past protesters. There were protesters at the White House and along both the Constitution Ave and Independence Ave motorcade route options.
Trump or Secret Service sent what appeared to be the dummy motorcade past the largest protest at 3ed and Constitution Ave, then afterwards police set up pen fence as a dummy defense of Constitution Ave. This was apparently a diversion to convince protesters that Trump would use that route, while the real motorcade used the Independence Ave route, passing the smaller protest presence. Trump was unable to evade protesters entirely without detouring the motorcade far off-route through unsecured parts of the city, so he had to suck it up. The Russian flags along the route were a reminder that he depended on Vladimar Putin to interfere in the 2016 election and as a result will always be Putin's vassal.
Bonus at end of video: Luke Kuhn tells alt-right figures Jack Posobiec and Mike Cernovich to "bring it on" and "run with the big dogs or stay on the porch"